a bad egg的用法和样例：
- Everyone knows that he is a bad egg.
- As sure as egg is egg, he is a bad egg.
- A person who could do this must be a bad egg.
- At first I trusted him, but soon I found he's a bad egg.
- He's been in prison several times for all sorts of crimes; he's a bad egg.
a bad egg的相关资料：